Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure
This work reports the behavior of annealed commercially pure cold-drawn thin iron wires. Primary recrystallization is complete after holding for 180 s at 1123 K. After recrystallization, grain growth takes place within the central region but not close to the surface. For annealing times up to 14400 ...
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doaj-c1e45f7019a8471baf8ead60e4934c762020-11-25T02:46:29ZengElsevierJournal of Materials Research and Technology2238-78542020-09-01951109911110Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructureD.R. Almeida Jr.0P.R. Rios1D. Zöllner2H.R.Z. Sandim3Department of Materials Engineering, Lorena School of Engineering, University of São Paulo (USP), Lorena, 12602-810, Brazil; Corresponding author.Escola de Engenharia Industrial Metalúrgica de Volta Redonda, Universidade Federal Fluminense (UFF), Volta Redonda, 27255-125, BrazilB CUBE – Center for Molecular Bioengineering, TU Dresden, D-01307, Dresden, GermanyDepartment of Materials Engineering, Lorena School of Engineering, University of São Paulo (USP), Lorena, 12602-810, BrazilThis work reports the behavior of annealed commercially pure cold-drawn thin iron wires. Primary recrystallization is complete after holding for 180 s at 1123 K. After recrystallization, grain growth takes place within the central region but not close to the surface. For annealing times up to 14400 s, the grain size distribution broadens and the texture strengthens. The resulting texture is intense along the direction <110> parallel to the wiredrawing direction (WD). For longer times, abnormal grain growth takes place. The center of the wire is the preferred place for abnormal grain growth. By contrast, the grains closer to the surface do not experience any growth, and abnormal grains cannot consume them. Throughout the microstructure, one finds AlN and MnS particles. Close to the wire surface, there is a significantly higher particle density than in the center. We discuss mechanisms for the onset of abnormal grain growth, considering particle pinning and crystallographic texture. We observed two kinds of abnormal grains. Most abnormal grains belonged to the <110 > // WD fiber texture component, whereas a minority did not. We propose two mechanisms of abnormal grain growth initiation. The first mechanism explains the initiation of the abnormal grains with the assistance of the texture. The second mechanism associates the formation of a candidate abnormal grain to the topological path of the largest grains during normal grain growth preceding the onset of abnormal grain growth.http://www.sciencedirect.com/science/article/pii/S2238785420315635Abnormal grain growthIron wireParticle pinningTextureInitiation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D.R. Almeida Jr. P.R. Rios D. Zöllner H.R.Z. Sandim |
spellingShingle |
D.R. Almeida Jr. P.R. Rios D. Zöllner H.R.Z. Sandim Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure Journal of Materials Research and Technology Abnormal grain growth Iron wire Particle pinning Texture Initiation |
author_facet |
D.R. Almeida Jr. P.R. Rios D. Zöllner H.R.Z. Sandim |
author_sort |
D.R. Almeida Jr. |
title |
Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure |
title_short |
Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure |
title_full |
Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure |
title_fullStr |
Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure |
title_full_unstemmed |
Abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure |
title_sort |
abnormal grain growth in thin wires of commercially pure iron with anisotropic microstructure |
publisher |
Elsevier |
series |
Journal of Materials Research and Technology |
issn |
2238-7854 |
publishDate |
2020-09-01 |
description |
This work reports the behavior of annealed commercially pure cold-drawn thin iron wires. Primary recrystallization is complete after holding for 180 s at 1123 K. After recrystallization, grain growth takes place within the central region but not close to the surface. For annealing times up to 14400 s, the grain size distribution broadens and the texture strengthens. The resulting texture is intense along the direction <110> parallel to the wiredrawing direction (WD). For longer times, abnormal grain growth takes place. The center of the wire is the preferred place for abnormal grain growth. By contrast, the grains closer to the surface do not experience any growth, and abnormal grains cannot consume them. Throughout the microstructure, one finds AlN and MnS particles. Close to the wire surface, there is a significantly higher particle density than in the center. We discuss mechanisms for the onset of abnormal grain growth, considering particle pinning and crystallographic texture. We observed two kinds of abnormal grains. Most abnormal grains belonged to the <110 > // WD fiber texture component, whereas a minority did not. We propose two mechanisms of abnormal grain growth initiation. The first mechanism explains the initiation of the abnormal grains with the assistance of the texture. The second mechanism associates the formation of a candidate abnormal grain to the topological path of the largest grains during normal grain growth preceding the onset of abnormal grain growth. |
topic |
Abnormal grain growth Iron wire Particle pinning Texture Initiation |
url |
http://www.sciencedirect.com/science/article/pii/S2238785420315635 |
work_keys_str_mv |
AT dralmeidajr abnormalgraingrowthinthinwiresofcommerciallypureironwithanisotropicmicrostructure AT prrios abnormalgraingrowthinthinwiresofcommerciallypureironwithanisotropicmicrostructure AT dzollner abnormalgraingrowthinthinwiresofcommerciallypureironwithanisotropicmicrostructure AT hrzsandim abnormalgraingrowthinthinwiresofcommerciallypureironwithanisotropicmicrostructure |
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1724757962995531776 |